4.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold johan@kernel.org
commit d397dbe606120a1ea1b11b0020c3f7a3852da5ac upstream.
Use the new of_get_compatible_child() helper to lookup the mdio child node instead of using of_find_compatible_node(), which searches the entire tree from a given start node and thus can return an unrelated (i.e. non-child) node.
This also addresses a potential use-after-free (e.g. after probe deferral) as the tree-wide helper drops a reference to its first argument (i.e. the node of the device being probed).
Fixes: aa09677cba42 ("net: bcmgenet: add MDIO routines") Cc: stable stable@vger.kernel.org # 3.15 Cc: David S. Miller davem@davemloft.net Reviewed-by: Florian Fainelli f.fainelli@gmail.com Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Rob Herring robh@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/ethernet/broadcom/genet/bcmmii.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c +++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c @@ -342,7 +342,7 @@ static struct device_node *bcmgenet_mii_ if (!compat) return NULL;
- priv->mdio_dn = of_find_compatible_node(dn, NULL, compat); + priv->mdio_dn = of_get_compatible_child(dn, compat); kfree(compat); if (!priv->mdio_dn) { dev_err(kdev, "unable to find MDIO bus node\n");